Pressure Control Valve
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United States of America Patent
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N/A
Issued Date -
Jan 17, 2008
app pub date -
Jul 10, 2007
filing date -
Jul 13, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a pressure controlling valve 3 for causing deformation of a resilient member 32 by a pressure difference between a CO.sub.2 gas pressure in a sealed space (heat sensitive portion) corresponding to a refrigerant temperature and a high pressure of the CO.sub.2 refrigerant in the refrigeration cycle to open and close the valve, a volume ratio Vs/(Vs-Vo) of a total volume (Vs) of the sealed space when the valve is fully closed and a total volume (Vo) of the sealed space when the valve is fully open is greater than 1.9 or 2.4. To improve this volume ratio, a cavity 31d communicating with the sealed space is formed inside a displacement transmission member 31 coupled with the resilient member, or a recess portion 35a is formed in a cover member 35a, or a member communicating with the sealed space is connected.
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